The system Mini or of renewal is thought to make possible the installation of a persiana when it has a window without persiana and does not want to do work, or simply that it does not want to remove the window.??ueda On of the carpentry, but it installs by the outside, in front of the window or on the façade, of simple way and without hardly need to do work.?ar The drawer by out of the window, there is not any possible thermal transfer, economizando besides the expense of energy.